Journal
FUEL
Volume 263, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2019.116681
Keywords
Biomass pyrolysis; Vapor-solid interaction; Cellulose; Hemicellulose; Lignin
Categories
Funding
- National Key Research and Development Plan of China [2018YFB1501403]
- National Nature Science Foundation of China [51622604, 51876061]
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Secondary reactions, including those caused by interactions between vapor and solid phases, are unavoidable during biomass pyrolysis. In this study, the vapor-solid interaction between biomass components (cellulose, hemicellulose, and lignin) was investigated in a two-stage fixed-bed reactor. The results indicated that volatiles from hemicellulose promoted the breakdown of cellulose glycoside bonds and pyran rings as well as the removal of branched aliphatic chains and O-containing functional groups of lignin at 280 degrees C. Moreover, volatiles from cellulose produced abundant anhydrosugar, which was more prone to re-polymerization and to form aromatic rings on the lignin structure at 315 degrees C. As a result of the vapor-char interactions at 650 degrees C, the secondary decomposition of cellulose volatiles to gas products (decreasing by similar to 8 wt%) was inhibited, but carbonized products (increasing by similar to 3 wt%) tended to form, whereas hemicellulose vapor was more prone to decompose into low-molecular-weight liquid compounds, resulting in a high liquid yield (increasing by similar to 6 wt%). In addition, vapor-solid interactions accelerated the removal of O-containing functional groups of lignin volatiles, such as carbonyl and carboxyl, but inhibited the decomposition of H-containing functional groups, such as methyl and methylene. The finding is conducive to the understanding of the interactive mechanisms of biomass pyrolysis.
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